when mine wore out, (one of the little pins in the UJ eventually fails, and its not replaceable). I firstly replaced it with another set, but recently i have installed some MIP CVDs, but these are hard to find and quite expensive.
Interestingly enough, i had no problems with 12 months of running, then i had both sides go in a single evening, so they must design them to fail at exactly 50 odd race meetings

. Its not a bad idea to get some spare driveshafts, as out of the 3 22-4's at my club, we have probably broken 4 rear drive shafts and 3 fronts.
Losi themselves have brought out a CVA kit (same as CVD), but when I last looked, it was yet to hit British shores. ANd i have not looked if the CVA kit comes with the hexes you seek!!
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Tom
TLR 22-4 2.0, TLR 22 5.0 AC Elite,
Kindly Supported by Trackside Spares, TLR, Spektrum and Horizon Hobby